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  Na adsorption on Ru(0001): a low-energy electron-diffraction analysis of three ordered phases

Hertel, T., Over, H., Bludau, H., Gierer, M., & Ertl, G. (1994). Na adsorption on Ru(0001): a low-energy electron-diffraction analysis of three ordered phases. Surface Science, 301(1-3), 1-10. doi:10.1016/0039-6028(94)91282-3.

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 Creators:
Hertel, Tobias1, Author           
Over, Herbert1, Author           
Bludau, Horst1, Author           
Gierer, Martin1, Author           
Ertl, Gerhard1, Author           
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              

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 Abstract: Sodium adsorbed on the Ru(0001) surface below room temperature forms a number of ordered phases, commensurate as well as incommensurate. They are investigated by low-energy electron-diffraction (LEED) and work-function measurements (Δφ). The structural analyses for the p(2 × 2)-, (√3 × √3)R30°- and (3 × 3)-phases at coverages of 1/4, 1/3 and 4/9, respectively, reveal coverage-dependent adsorption sites. As for K adsorbed on Ru(0001), Na atoms occupy threefold fcc-sites in the p(2 × 2) phase while for the (√3 × √3)R30° phase the hcp site is favoured. A structural analysis of the (3 × 3) phase, including 4 adsorbate atoms within the unit cell, revealed that nearest-neighbour distances are maximized at the cost of occupying low symmetry sites. This conclusion is supported by comparison of relative theoretical and experimental adsorbate-induced spot intensities. For all three phases the Na hard-sphere radii are nearly the same and close to the covalent Pauling radius.

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Language(s): eng - English
 Dates: 1993-07-071993-08-241994-01-10
 Publication Status: Issued
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/0039-6028(94)91282-3
 Degree: -

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Title: Surface Science
  Abbreviation : Surf. Sci.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: 10 Volume / Issue: 301 (1-3) Sequence Number: - Start / End Page: 1 - 10 Identifier: ISSN: 0039-6028
CoNE: https://pure.mpg.de/cone/journals/resource/0039-6028